When I teach about asteroids, comets, and meteoroids, I use these notes based on Thinking Maps. There are three circle maps and one brace map.
The front is all about comets. The comets circle map has questions in the frame of reference box to help guide the students to key information. There is a box for students to draw and label a diagram of a comet. The brace map takes a comet and breaks it into its parts: head (nucleus and coma) and tails (gas/ion and dust).
The back side has empty circle maps for asteroids and meteoroids that you can have students complete based on what structure works best for your class (whole class, teams, partners, or independently).